Dielectric and calorimetric study of phase transitions in mixed diacetylene single crystals polymerizing in the solid state

Abstract

Dielectric and calorimetric experiments were performed on a series of pTS-pFBS mixed diacetylene single crystals. The electric permittivity measurements were carried out in the direction of growing polymer chains in the temperature range 80-333 K, as a function of the degree of polymerization of the samples. The specific heat measurements were performed on monomeric and fully polymerized samples in the temperature range 120-220 K. Phase transitions, already described in the literature for pure pTS crystals, were found to shift toward lower temperatures upon increasing the pFBS content in mixed crystals